File: predef.c

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llvm-toolchain-18 1%3A18.1.8-18
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// RUN: %clang_cc1 -fsyntax-only -verify %s

void abcdefghi12(void) {
 const char (*ss)[12] = &__func__;
 static int arr[sizeof(__func__)==12 ? 1 : -1];
}

char *X = __func__; // expected-warning {{predefined identifier is only valid}} \
                       expected-warning {{initializing 'char *' with an expression of type 'const char[1]' discards qualifiers}}

void a(void) {
  __func__[0] = 'a';  // expected-error {{variable is not assignable}}
}

// GCC permits this.
const char *b = __func__;  // expected-warning {{predefined identifier is only valid}}
const char *c = __FUNCTION__; // expected-warning {{predefined identifier is only valid}}
const char *d = __PRETTY_FUNCTION__; // expected-warning {{predefined identifier is only valid}}